/Engine/Plugins/Experimental/Mutable/Source/CustomizableObjectEditor/Public/MuCOE/ExtensionDataCompilerInterface.h
Don't save any references to objects under the container as string paths, e.g. usingTSoftObjectPtr, because the container will be moved to a different package during cooking and your paths won't be automatically updated.
[mu::ExtensionDataPtrConst](API\Plugins\MutableRuntime\MuR\ExtensionDataPtrConst) MakeStreamedExtensionData ( [UCustomizableObjectExtensionDataContainer](API\Plugins\CustomizableObject\MuCO\UCustomizableObjectExtensionData-) *& OutContainer )